I have 1.5 million rows in my table and I need to delete these,
problem is temp space is very low , so I need to add commit scope of 1000, that is after every 1000 rows it should commit.
I am not getting any idea to do this,Please can antbody help!

As this has been asked and answered zillion times, I think you should have no difficulty to find the answer.
Of course, the correct answer is to enlarge the tablespace (undo/rollback not temp) to do it in a single transaction or to use one of the alternative way and NOT to use intermediate commits.